Timezones.in — Stay In Sync

Convert Greenwich Mean Time to Hawaii-Aleutian Time

GMT · UTC+1 → HAST · UTC−9

GMT is 10 hours ahead of HAST

London · BST

Tuesday, 8 September 2026

Adak · HADT

Monday, 7 September 2026

When are both sides at work?

0003060912151821
LondonBST · +01:00
0003060912151821
AdakHADT · -09:00
1417202302050811

No overlap in standard working hours. Closest workable window: 19:00–23:00 in London, which is 09:00–13:00 in Adak.

Working (09–18) Awake, off the clock Asleep (23–07)

Pick a time and share it

08:05 Tue 8 Sep London = 22:05 Mon 7 Sep Adak

Open in planner

Post this

XLinkedInWhatsAppFacebookTelegramEmail

Hour-by-hour conversion

London (GMT)Adak (HAST)
00:0014:00prev. day
01:0015:00prev. day
02:0016:00prev. day
03:0017:00prev. day
04:0018:00prev. day
05:0019:00prev. day
06:0020:00prev. day
07:0021:00prev. day
08:0022:00prev. dayNow
09:0023:00prev. day
10:0000:00
11:0001:00
12:0002:00
13:0003:00
14:0004:00
15:0005:00
16:0006:00
17:0007:00
18:0008:00
19:0009:00
20:0010:00
21:0011:00
22:0012:00
23:0013:00

About this conversion

GMT here means Greenwich Mean Time, represented by London (Europe/London), currently UTC+1. HAST means Hawaii-Aleutian Time, represented by Adak (America/Adak), currently UTC−9.

GMT is used by 22 zones, including United Kingdom. If you meant a different one, see every meaning of GMT.

HAST is used by 2 zones, including United States. See every meaning of HAST.

Working hours are shown as 09:00–18:00 local, and sleeping hours as 23:00–07:00. The hour table is anchored on the current day in London; day boundaries are marked where the date differs.

Quick answers

  • 09:00 GMT is 23:00 HAST
  • 12:00 GMT is 02:00 HAST
  • 15:00 GMT is 05:00 HAST
  • 18:00 GMT is 08:00 HAST

Related conversions